有乙個表，表名是xx，有abcd四個字段，正常情況下，abc、abd這三個欄位都可以唯一確定一條記錄，按理應該做成唯一索引，但由於歷史原因，該錶存在重複資料，但要刪掉哪一條需要人工判斷，無法用語句批量刪除，於是唯一索引加不上。但為了保證以後資料的準確性，需要控制新插進去的記錄是唯一的。於是我寫了乙個觸發器，當新插進去的記錄與現有記錄重複時就報錯：
create global temporary table g_xx_temp
(flatdocid int,
modeldocid int,flatdocrev int,modeldocrev int) on commit delete rows;
create or replace trigger trg_xx_row
before insert or update
on xx
for each row
declare
-- local variables here
begin
insert into g_xx_temp(flatdocid,modeldocid,flatdocrev,modeldocrev)
values(:new.flatdocid,:new.modeldocid,:new.flatdocrev,:new.modeldocrev);
end;
create or replace trigger trg_xx
after insert or update
on xx
--for each row
declare
-- local variables here
v_count int;
v_flatdocid int;
v_modeldocid int;
v_flatdocrev int;
v_modeldocrev int;
cursor c_temp is select flatdocid,modeldocid,flatdocrev,modeldocrev from g_xx_temp;
begin
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